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Children's Go Mathematics Competition
This problem is mainly to add up the students who participated in the two competitions (160 and 80), because both those who participated in Go and those who participated in calligraphy. After adding up, the number of participants in both competitions is equivalent to one more time, so if you subtract the number of participants in both competitions, you will get the total number.

That is, 160+80-30=2 10 (name)